Formation and displacement of bubbles in a packed bed

Details Formation and displacement of bubbles in a packed bed Formation and displacement of bubbles in a packed bed

2010-10-18

arxiv.org/abs/1010.4196v1

Physics

Fluid Dynamics

Scientific paper

The fluid dynamics video show a gas stream which is injected into a packed bed immersed in water and fluid dynamcis video present the dynamics involved. The refractive index of the water an the packed bed are quite similar and the edges of the spherical particles can be seen. Two distinctive regimens can be observed. The first one, for low air flow rates, which is characterized by the percolation of the air thought the interstitial space among particles. And the second one, for high air flow rates, which is characterized by the accumulation of air inside the packed bed without percolation, it can be observed that the bubble pull apart the particles apart. Furthermore, for the first case the position of the particles remains constant while for the second one a circulation of particles is induced by the bubbles flow.

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